DROP TABLE IF EXISTS table_for_synchronous_mutations1; DROP TABLE IF EXISTS table_for_synchronous_mutations2; SELECT 'Replicated'; CREATE TABLE table_for_synchronous_mutations1(k UInt32, v1 UInt64) ENGINE ReplicatedMergeTree('/clickhouse/tables/table_for_synchronous_mutations', '1') ORDER BY k; CREATE TABLE table_for_synchronous_mutations2(k UInt32, v1 UInt64) ENGINE ReplicatedMergeTree('/clickhouse/tables/table_for_synchronous_mutations', '2') ORDER BY k; INSERT INTO table_for_synchronous_mutations1 select number, number from numbers(100000); SYSTEM SYNC REPLICA table_for_synchronous_mutations2; ALTER TABLE table_for_synchronous_mutations1 UPDATE v1 = v1 + 1 WHERE 1 SETTINGS mutations_sync = 2; SELECT is_done FROM system.mutations where table = 'table_for_synchronous_mutations1'; -- Another mutation, just to be sure, that previous finished ALTER TABLE table_for_synchronous_mutations1 UPDATE v1 = v1 + 1 WHERE 1 SETTINGS mutations_sync = 2; SELECT is_done FROM system.mutations where table = 'table_for_synchronous_mutations1'; DROP TABLE IF EXISTS table_for_synchronous_mutations1; DROP TABLE IF EXISTS table_for_synchronous_mutations2; SELECT 'Normal'; DROP TABLE IF EXISTS table_for_synchronous_mutations_no_replication; CREATE TABLE table_for_synchronous_mutations_no_replication(k UInt32, v1 UInt64) ENGINE MergeTree ORDER BY k; INSERT INTO table_for_synchronous_mutations_no_replication select number, number from numbers(100000); ALTER TABLE table_for_synchronous_mutations_no_replication UPDATE v1 = v1 + 1 WHERE 1 SETTINGS mutations_sync = 2; SELECT is_done FROM system.mutations where table = 'table_for_synchronous_mutations_no_replication'; -- Another mutation, just to be sure, that previous finished ALTER TABLE table_for_synchronous_mutations_no_replication UPDATE v1 = v1 + 1 WHERE 1 SETTINGS mutations_sync = 2; SELECT is_done FROM system.mutations where table = 'table_for_synchronous_mutations_no_replication'; DROP TABLE IF EXISTS table_for_synchronous_mutations_no_replication;